<template>
    <div class="header-container">
        <div class="header-left flex-box">
            <el-icon class="icon" size="20" @click="store.commit('collapseMenu')">
                <Fold />
            </el-icon>
            <ul class="flex-box">
                <li v-for="(item, index) in selectMenu" 
                :key="item.path" 
                class="tab flex-box"
                :class="{selected :route.path=== item.path}"
                >
                     <el-icon  size="12" >
                        <component :is="item.icon"/>
                     </el-icon>
                     <router-link class="text flex-box" :to="{path:item.path}">
                        {{ item.name }}
                     </router-link>
                      <el-icon  size="12" class="close" @click="closeTab(item,index)">
                        <Close />
                     </el-icon>
                </li>
            </ul>
        </div>
        <div class="header-right">
            <el-dropdown>
                <div class="el-dropdown-link flex-box">
                    <el-avatar src="https://cube.elemecdn.com/0/88/03b0d39583f48206768a7534e55bcpng.png" />
                    <p class="user-name">admin</p>
                </div>
                <template #dropdown>
                    <el-dropdown-menu>
                        <el-dropdown-item>Action 1</el-dropdown-item>
                        <el-dropdown-item>Action 2</el-dropdown-item>
                        <el-dropdown-item>Action 3</el-dropdown-item>
                        <el-dropdown-item disabled>Action 4</el-dropdown-item>
                        <el-dropdown-item divided>Action 5</el-dropdown-item>
                    </el-dropdown-menu>
                </template>
            </el-dropdown>
        </div>
    </div>
</template>
<script setup>
import { useStore } from 'vuex'
import { computed } from 'vue';
import { useRoute,useRouter } from 'vue-router';
//拿到store的实例
const store = useStore()
//当前的路由对象
const route=useRoute()
const router=useRouter()
const selectMenu = computed(() => store.state.menu.selectMenu)

//点击关闭tag
const closeTab=(item,index)=>{
    store.commit('closeMenu',item)
    //删除的非当前页tag
    if(route.path!==item.path){
        return
    }
    const selectMenuData=selectMenu.value
    //删除的最后一项
    if(index===selectMenuData.length){
        //如果tag只有一个元素
        if(!selectMenuData.length){
            router.push('/')
        }
        else{
            router.push({
                path:selectMenuData[index-1].path
            })
        }
    } 
    else{//如果删除中间的tag
        router.push({
            path:selectMenuData[index].path
        })
    }
}
</script>

<style lang="less" scoped>
.flex-box {
    display: flex;
    align-items: center;
    height: 100%;
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
    background-color: #fff;
    padding-right: 25px;

    .header-left {
        height: 100%;

        .icon {
            width: 45px;
            height: 100%;
        }

        .icon:hover {
            background-color: #f5f5f5;
            cursor: pointer;

        }

        .tab{
            padding: 0 10px;
            height: 100%;
            .close{
            visibility: hidden;
            }
            .text{
            margin: 0 5px;
            }
            &.selected{
                a{
                    color: #409eff;
                }
                i{
                    color: #409eff;
                }
                background-color: #f5f5f5;
            }
        }

        .tab:hover{
            background-color:#f5f5f5 ;
            .close{
                visibility: inherit;
                color: #000;
                cursor: pointer;
            }
        }

        
    }

    .header-right {
        .user-name {
            margin-left: 10px;
        }
    }

    a{
        height: 100%;
        color: #333;
        font-size: 15px;
    }
}
</style>